Tandem breakers could be used to free up some space. I've never used them myself but there's enough electricians on this forum to weigh in. Example I grabbed at random attached.
The Square D by Schneider Electric Homeline Single-Pole Tandem Circuit Breaker consists of (2) single-pole, 20 Amp breakers in 1 pole space. It is used for overload and short-circuit protection of your